| Bluehouse Chorley Limited | Wholesale & retail | 2011 |
| Bluestone NW Limited | Construction | 2022 |
| Bluetech Enterprise Limited | Information & communication | 2016 |
| Bluetech Waterfront Solutions Limited | Professional & scientific | 2018 |
| BM Clothing Ltd | Wholesale & retail | 2020 |
| BM Plumbing & Heating Limited | Construction | 2020 |
| BMC Hospitality Consultancy Limited | Administrative & support | 2017 |
| BME Consultancy Services Ltd | Administrative & support | 2020 |
| BMI Leisure Ltd | Hospitality | 2023 |
| BNW (Holdings) Limited | Financial services | 2001 |
| Boardman Homes Limited | Construction | 2020 |
| Boatel Party Cruises Limited | Transport & logistics | 2014 |
| BOB & Dick Holdings Limited | Financial services | 2020 |
| BOB & Dick Investments Limited | Real estate | 2022 |
| BOB a Baker Ltd | Transport & logistics | 2020 |
| BOB Elliot & Co. Limited | Wholesale & retail | 1998 |
| Body Culture Ltd | Arts & recreation | 2016 |
| Body Mech Ltd | Health & social care | 2022 |
| Bodywork Company Performing Arts Cambridge | Education | 1995 |
| Bohne Limited | Professional & scientific | 2023 |
| Bollinhale Limited | Financial services | 2014 |
| Bolt Science Limited | Information & communication | 1992 |
| Bolton Aesthetics Ltd | Health & social care | 2024 |
| Bolton Beer Company Ltd | Wholesale & retail | 2022 |
| Bolton Safety Glass Limited | Extraterritorial | 2004 |
| Bolton Windscreens Limited | Extraterritorial | 2008 |
| Bombay Velvet Ltd | Hospitality | 2024 |
| Bonney Greenhalgh & Co. Limited | Professional & scientific | 2009 |
| BOO Consultz Limited | Real estate | 2019 |
| Book Boyfriends Ltd | Wholesale & retail | 2026 |
| Book Property Management Limited | Real estate | 2017 |
| Bookitzone Ltd | Administrative & support | 2012 |
| Boost Green Marketing Ltd | Professional & scientific | 2025 |
| Booth Haulage Services Limited | Transport & logistics | 2017 |
| Booths Hill Court Management Limited | Real estate | 2022 |
| Border Welding and Engineering Supplies Ltd | Wholesale & retail | 2022 |
| Borderdeal Limited | Construction | 1993 |
| Borek Couriers Ltd | Transport & logistics | 2018 |
| Boss Shot Limited | Wholesale & retail | 2017 |
| Boss Tunnelling Ltd | Construction | 2017 |
| Bostania Ltd | Hospitality | 2018 |
| Botany Aviation Ltd. | Transport & logistics | 2002 |
| Botany Bay Asset Management Limited | Financial services | 2023 |
| Botany Bay Boatyard Limited | Manufacturing | 2021 |
| Boughey International Limited | Administrative & support | 2023 |
| Bouncelona Limited | Other services | 2020 |
| Bournemouth Airport Transfers Ltd | Transport & logistics | 2021 |
| Bowen Bakeries Limited | Manufacturing | 2012 |
| Bowen Pies (Chorley) Limited | Manufacturing | 2020 |
| Bowker Security Solutions Ltd | Administrative & support | 2019 |
| Bowman Financial Planning Limited | Extraterritorial | 1993 |
| Bowness Limited | Real estate | 2022 |
| Boxco MCR Ltd | Hospitality | 2026 |
| Boxd Ventures Ltd | Wholesale & retail | 2025 |
| Boxoso Ltd | Wholesale & retail | 2008 |
| Boxwood Holdings Limited | Professional & scientific | 2001 |
| Boxwood Leisure Limited | Public administration | 2001 |
| Boys Club Euxton Ltd | Other services | 2025 |
| BP Rendering Services Limited | Construction | 2010 |
| BPD Site Services Ltd | Construction | 2021 |
| BR786 Limited | Extraterritorial | 2018 |
| Bracewell Farms Limited | Agriculture & fishing | 1959 |
| Brackson Enterprise Ltd | Hospitality | 2019 |
| Braconash Garage Ltd | Wholesale & retail | 2015 |
| Brad Estates Limited | Administrative & support | 1994 |
| Bradka Ltd | Wholesale & retail | 2022 |
| Bradley Harrison Limited | Administrative & support | 2013 |
| Bradley Property Management (Chorley) Ltd | Administrative & support | 2020 |
| Bradshaw Construction and Engineering Services Ltd | Construction | 2021 |
| Brady Surveyors Limited | Professional & scientific | 2018 |
| Bragg 1970 Limited | Extraterritorial | 2014 |
| Braidie Limited | Wholesale & retail | 2023 |
| Braithwaites Business Park Ltd | Real estate | 2022 |
| Bran and Van Removals Ltd | Transport & logistics | 2023 |
| Branch Agency Ltd | Information & communication | 2022 |
| Branch Media Group Limited | Professional & scientific | 2024 |
| Brand New Start Housing CIC | Real estate | 2022 |
| Brand Spot UK Limited | Wholesale & retail | 2025 |
| Brand-Technology Services Ltd | Information & communication | 2015 |
| Brandall Facilities Management Ltd | Administrative & support | 2014 |
| Branded W&D Limited | Wholesale & retail | 2025 |
| Brandspark Commercials Ltd | Administrative & support | 2016 |
| Brave Ace Solutions Limited | Transport & logistics | 2024 |
| Brayber Group Limited | Administrative & support | 2017 |
| Brayzel Boats Limited | Manufacturing | 2012 |
| Brayzel Narrowboats Limited | Professional & scientific | 2010 |
| Breaghwy Ltd | Other services | 2025 |
| Breckland Holdings Limited | Professional & scientific | 2005 |
| Breckland Leisure Limited | Public administration | 2002 |
| Brennan Digital Solutions Ltd | Information & communication | 2024 |
| Brentwood Professional Services Limited | Professional & scientific | 2026 |
| Brentwood Properties Ltd | Real estate | 2015 |
| Brereworth Ltd | Professional & scientific | 2024 |
| Bretherton Coachworks Limited | Manufacturing | 2004 |
| Brewed BOY TAP Houses Limited | Wholesale & retail | 2018 |
| Brian Taylor Enterprises Limited | Real estate | 1988 |
| Brianco Limited | Transport & logistics | 2017 |
| Briar Homes (NW) Limited | Construction | 2004 |
| Briarcroft Building Solutions (UK) Limited | Construction | 2010 |
| Brick Technology Limited | Information & communication | 2002 |